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n. Abbr. fc or ft-c
A unit of measure of the intensity of light falling on a surface, equal to one lumen per square foot and originally defined with reference to a standardized candle burning at one foot from a given surface.


(Units) a former unit of illumination, equal to one lumen per square foot or 10.764 lux


a unit equivalent to the illumination produced by a source of one candle at a distance of one foot and equal to one lumen incident per square foot.
References in periodicals archive ?
Typically, urban planning goals are to flood areas with as many foot-candles of light as possible.
Department of Agriculture (4) (USDA), every room where utensils for dairy products are produced, packaged or washed must have at least 30 foot-candles of light intensity on all work surfaces.
The results of their analysis show a significant decrease in the night-to-day crash rate ratio with an increase of average horizontal lighting levels, which are measured in foot-candles, or lux.
In addition to producing the foot-candles necessary for the space, the lighting features an occupancy sensor control for a facility that is in continuous operation.
That's measured in foot-candles (based on English units) or, more commonly these days, the metric unit lux.
The new court lighting package delivers light levels of more than 16 foot-candles across the full playing area, while achieving extremely even light levels, a max/min ratio of only 2.71.
Light is measured in foot-candles -- the amount of light cast on a square foot area by a candle at 1 foot distance -- and the sun on a clear summer day can bathe us in 10,000 foot-candles.
Touch the screen to define the boundaries of the actual area to be illuminated and virtually set up and aim the portable light towers to determine the placement and quantity of the towers, as well as the light configuration that most efficiently lights the worksite to the desired level of illumination, which is measured in foot-candles. After determining the number of towers needed, sales, rental or other specific information may be requested through the app if desired.
When I converted foot-candles to lux, I noticed how
Rechargeable batteries power XV1 for a full day's work, delivering up to 4,000 foot-candles of light.
In fact, manufacturers and utility companies figured prominently in the IES membership rolls and committees, fostering recommended light levels in access of 100 foot-candles. At that time, Bill Lam and others in the then-small lighting design community took issue with these recommendations, calling instead for the increased application of lighting quality, in combination with thoughtful design considerations.
The UV-B (312nm) intensity of the Bi-O-Vision can be adjusted without preset stops--its ranges go from 6,000 to 3,000 [micro]W/[cm.sup.2] and the white light output can be regulated to fall between 1,000 and 2,000 foot-candles (93 to 186 lux).